Duplicating flask for dental models



DUFLIGATING FLASH FOR DENTAL MGDELS Filed July 3,

Patented Mar. 26, 1946 frasspatrfff i. f-DUnmoA'rINmFrnsKEortfnEN'rALMoDELs .eappucanun ann-yes, 1943, Vserial No. 493,356

ffnentalizmndelsiiand thembjectscf.; myfsinvention tare:

:zlirsttc providefarlduplicatmgiflask foridental .fmo'dels:inwvhichimpres'sioni.materialsisfsubjected `ltogpressurei`around;thefd'ental` model .a Second, to'.iprovidet:avduplicatingflaskffofthis '.L'class which .ith-e'impression lmaterial sJfsc ifpressedaaroundthedentalmodehthatitherearez'no A.fbubblesdsinallrspa'ces; orif-aults; f

-;Third,:ztof: provida a; duplicatingidiask u:,of this class with meansto.facilitatethezassembiyoofthe asklwithitheimodelpositioned therein;

Fourth, to provide a duplicating fiask of this class in which theimpression material is subjected to spring pressure during the periodthe cast is being formed;

Fifth, to provide a duplicating flask of this class which is easy tooperate, eicient in its action and which will not readily deteriorate orget out of order.

With these and other objects in view as will appear hereinafter, myinvention consists of certain novel features of construction,combination and arrangement of parts and portions as will be hereinafterdescribed in detail and particularly set forth in the appended claims,reference being had to the accompanying drawing and to the characters ofreference thereon which form a part of this application in which:

Figure 1 is a longitudinal sectional view cf my duplicating ask fordental models showing parts and portionsin elevation to facilitate theillustration; Fig. 2 is a transverse sectional View taken from the line2-2 of Fig. l; Fig. 3 is a transverse sectional view taken from the line3--3 of Fig. 1; Fig. 4 is a top or plan view thereof.

Similar characters of reference refer to similar parts and portionsthroughout the several views of the drawing:

The flask base member I, flask body member 2, ask cap 3, plunger 4,plunger shaft 5, plunger spring 6, plunger shaft handle l, and spacermember 8 constitute the principal parts of my duplicating flask fordental models.

The base member I is a flat plate-like member provided with an upwardlyextending annular ange Ia, which iiange is positioned in. spacedrelation from the outer edge of the base member I, as shown best in Fig.1 of the drawing and this flange is threaded at Ib at its outer sidearranged to receive internal threads on `the large end of the flask bodymember 2. This flask body member 2 is preferably an annular hollowmember with its side walls converging upwardly (cifrar-:32)

Y sand :inwardly *,'in'vcurvedvformiand# of'fsuicient.fs'izeitofrreceive dental: models. sto-.take simpressions:from.'forzduplicating:purposes. Thismembermis e zprovidedat .its upperLendiwitlr a reduced-straight 5- i'icylindrical portion f' 2 a, which:extends upwardly .asomedistance,l as shownbest-inf.Figc'lfrofithetdrawiiing. Reciprocall'y ..zmounted iny thisylindrical g1-10 T This. cylindricaltportion22ans,:providediataitssnpirp'eriouterzsidewithithreads; '2b onf/whi'ch'ssscrew- .n ithreade'dacap: 3 ivhichs-is providedwvithfanfouter "i extendingJlangeSdwhichlgisrinternally threaded to receive the threads 2b. Thiscap 3 is provided with a central bore 3b of substantially the samediameter as the inner side of the cylinder portion 2a and-extendsupwardly some distance from the lower side' of the cap 3. It is alsoprovided with a reduced bore 3c in which is reciprocally mounted aplunger shaft 5 which extends upwardly above the upper side of the cap 3and is provided on its upper end with a handle 1, which is preferablyscrew-threaded thereon.

Positioned around the shaft 5 and supported at one end on the plunger 4and its other end at the inner end of the bore 3b is the plunger spring6 which is a compression spring tending to force the plunger inwardlyinto the cylinder portion 2a of the ask body 2.

Positioned between the upper end of the member 3 and the handle l andover the shaft 5 is a U-shaped spacer 8 which is for the purpose ofholding the spring compressed a certain extent whil-e placing the cap 3on the cylinder portion 2a. after which it is removed to permit thespring to force the plunger inwardly in the cylinder portion 2a. forcompressing the impression material and forcing it around the dentalmodel to be duplicated.

The operation of my duplicating fiask for dental models is substantiallyas follows:

With the base I unscrewed from the body member 2 and the cap 3 unscrewedfrom the portion 2a of the body member, the dental model is positionedon the base I in proper position and the body member 2 is screw-threadedthereon, after which the impression material is placed in the flask 2through the cylindrical portion 2a lled substantially to the top aroundthe dental model. Then with the spacer member 8 in position between thehandle 1 and the upper end of the cap 3, the cap 3 is screw-threadedonto the cylindrical portion 2a with the plunger 4 positioned in saidcylindrical portion, after which the handle 'I is slightly raised andthe spacer member 8 removed which permits the spring to force thelplunger 4 downwardly against the vimpressioned material and forcing itaround the dental model `so that there are no bubbles, spaces ory faults^ask` body member provided with an integral re-V duced cylindrical upperend and a vwall diverging therearound after which the mold is removed'by removing the base i from the body member `,2 Y

and then proceed in the conventional manner.

Though I have shown and described a particular construction, combinationand arrangement of partsvand portions, I do not wish to be limited tothis particular construction, .combination and arrangement, but desireto include in the scopeof'said plunger shaft ab'ove said cap andremovreduced cylindrical upper endrand a Vwall divergof my `inventionthe construction,'combination y and arrangement substantially as setforth 4in theY appended claims.

Having thus described ymy invention, what 1 claim as new and desire ytosecure by Letters; I

Patent is:

1. A duplicating ask for dental models ofthe class describedcomprisingrthe combination of a "downwardly'therefrom, a capscrew-threaded on said upper end and provided with a recess there- 'aplunger reciprocally mounted in said cy- Y lindricalupper end of saidask body member and provided with a reduced shaft reciprocally mountedin said cap with the upper end of said shaftpassingthrough said cap, acompression spring surrounding said shaft in the recess in said capwith'one end against said plunger tending to rforce it inwardly in saidcylindrical upper end of said iiask, a handle secured on the upper ending downwardly therefrom, a cap screwthread ed on said upper end andvprovided with a recess therein, a plunger reciprocally'mounted in saidcylindrical upper end of said flask body member Yand provided lwith' areduced shaft reciprocally Vmounted in said cap with the upper end ofsaid shaft passing through said cap, a compression spring surroundingsaid shaft in the recessin said vcap with one end against said plungertending to force it'inwardly insaid cylindrical .upper end of said ask,:a'handle secured onthe upper f end of said plunger shaft above said capand removable spacer means between Vsaid Vhandle and said cap forholding said handle 'in spacedlrelation to said cap when in.position,'fwhereby said plunger, plunger shaft and saidv handle arelowered by the action of said spring when `said spacer is removed andmay be .raised by pulling on said handle, said ask' body member providedwith a bottom arranged to be secured -thereto and yreadily removedtherefrom.

NELSON INGSQLL, .la

